Demon Slayer: From the Start, I Master Sun Breathing and Stop Nezuko from Becoming a Demon

After transmigrating into the world of Demon Slayer, he binds himself to the Myriad Realms Reward System. All he has to do is kill demons to earn rewards.

From the start, he comes upon Muzan Kibutsuji slaughtering the Kamado Family. Beiming Youtai appears, imitates Yoriichi Tsugikuni’s Sun Breathing, and scares Muzan off, saving Nezuko. From then on, Beiming Youtai will right all the regrets of Demon Slayer!